If your screen has been flashing randomly it is because of an incompatibility between Razor and the Windows Vista to 8 Aero theme.

In order to fix this you must right click the Razor shortcut and select properties. Then click the compatibility tab and check disable visual themes and desktop composition. This will temporarily disable the Aero theme while Razor is running.

Problem solved.

Resizing UO game window using Razor

If you are using windows 7 or 8 do this:

1. Locate your Razor.exe (or a link to it), go in properties-> compatibility -> check the box "run this program as an administrator". All other programs such as UOAM, Easy UO, OpenEUO shall also be set to run as administrator otherwise they won't connect to each other.

2. Open Razor and login to UO. In Razor window, go in "more options" tab -> check the box "force game size" and configure the new resolution you want. Try setting to 1080 x 810 resolution.

3. Close Razor and start it again, to make the changes effective.Note: UO client and/or the server limits the tiles you can view, if you make it too large (around 940 width/height or larger) you will see the corners greyed out (the bigger the resolution, the bigger the greyed out corners will get).